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IndustryArena Forum > Mechanical Engineering > Mechanical Calculations/Engineering Design > How to design the minimum thread hole depth for different applications?

Thread: How to design the minimum thread hole depth for different applications?

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  1. 08-18-2013, 12:06 AM #1
    king2004s
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    Unhappy How to design the minimum thread hole depth for different applications?

    I see some M5 screws are short, maybe only 6mm long. Some M5 screws are 30 mm long.

    If I simplify the calculation and use equation "Friction = friction coefficient x normal force"

    Assume the bolt is in tension. The friction between the bolt and the tap hole should not change if I use a longer bolt, right?
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  2. 08-19-2013, 08:09 AM #2
    BigNizzy
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    8: Frictional Forces | Video Lectures | Physics I: Classical Mechanics | Physics | MIT OpenCourseWare
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  3. 08-21-2013, 01:43 PM #3
    MooseCat
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    Quote Originally Posted by king2004s View Post
    I see some M5 screws are short, maybe only 6mm long. Some M5 screws are 30 mm long.

    If I simplify the calculation and use equation "Friction = friction coefficient x normal force"

    Assume the bolt is in tension. The friction between the bolt and the tap hole should not change if I use a longer bolt, right?
    Yes, friction coefficient doesn't change. Generally minimum hole depth will be determined by the shear strength of the threads though. Longer bolt has more shear resistance. More shear resistance -> you can do it up tighter -> greater normal force -> More friction.
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  4. 08-21-2013, 01:55 PM #4
    BigNizzy
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    Also my general rule of thumb is 2.5 x D
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